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Although these conditions are quite scarce and will not normally pose a problem to owners and operators, they do exist in certain areas of the world and consequently must be dealt with, when encountered.
Therefore, to alleviate the possibility of fuel icing occurring under these unusual conditions, it is permissible to add ispropyl alcohol (TB 10-002) or ethylene glycol monomethyl ether (EGME) (TB 10-901) compound to the fuel supply.
ACAA
Validity : S / N 1 - 9999 1 2-11 -00Page 1
(DA) JUN 02
 
The introduction of alcohol or EGME compound into the fuel provides two distinct effects :
- it absorbs the dissolved water from the fuel,
- it lowers freezing temperature.
Alcohol, if used, should be mixed with the fuel in a concentration of 1 % of volume. Concentrations greater than 1 % are not recommended since they can be detrimental to fuel tank materials.
The manner in which the alcohol is added to the fuel is significant because alcohol is most effective when it is completely dissolved in the fuel. To ensure proper mixing, the following procedure is recommended :
- For best results, the alcohol should be added during the fueling operation by pouring the alcohol directly on the fuel stream issuing from the fueling nozzle.
- An alternate method that may be used is to premix the complete alcohol dosage with some fuel in a separate clean container (approximately 2 to 3 U.S. Gal. - 7 to 11 litres) and to transfer this mixture to the tank prior to the fueling operation.
Any high quality isopropyl alcohol may be used, such as anti-icing fluid or isopropyl alcohol (TB 10-002). Figure 1 provides alcohol - fuel mixing ratio information.
Ethylene glycol monomethyl ether (EGME) compounds, in compliance with MIL-I-27686, if used, must be carefully mixed with the fuel in concentration not to exceed 0.15 % of volume. Figure 1 provides EGME - fuel mixing ratio information.
CAUTION : MIXING OF THE EGME COMPOUND WITH THE FUEL IS EXTREMELY IMPORTANT. A CONCENTRATION IN EXCESS OF THAT RECOMMENDED (0.15 % OF VOLUME MAXIMUM) WILL RESULT IN DETRIMENTAL EFFECTS TO THE FUEL TANKS (DETERIORATION OF PROTECTIVE PRIMER AND SEALANTS), TO FUEL SYSTEM AND ENGINE COMPONENTS (DAMAGE TO SEALS). USE ONLY BLENDING EQUIPMENT RECOMMENDED BY THE MANUFACTURER TO OBTAIN PROPER PROPORTIONS.
DO NOT ALLOW CONCENTRATED EGME COMPOUND TO COME INTO CONTACT WITH THE AIRCRAFT FINISH AS THIS CAN CAUSE DAMAGE.
Prolonged storage of the aircraft will result in a water buildup in the fuel which "absorbs" the additive. An indication of this is when an excessive amount of water accumulates in the fuel tank sumps. The concentration can be checked using a differential refractometer. It is imperative that the technical manual for the differential refractometer be followed explicitely when checking the additive concentration.
ACAA
Validity : S / N 1 - 9999 12-11-00Page 2
(DA) JUN 02
　
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